Editing Astronomical radio source (section)

==Sources: not yet observed==
===Primordial black holes===
According to the Big Bang Model, during the first few moments after the Big Bang, pressure and temperature were extremely great. Under these conditions, simple fluctuations in the density of matter may have resulted in local regions dense enough to create black holes. Although most regions of high density would be quickly dispersed by the expansion of the universe, a primordial black hole would be stable, persisting to the present.

One goal of [[Astropulse]] is to detect postulated mini black holes that might be evaporating due to "[[Hawking radiation]]". Such mini black holes are postulated<ref>{{cite web |url=http://cerncourier.com/cws/article/cern/29199 |title=The case for mini black holes |publisher=Cern Courier |date=2004-11-24 |access-date=2010-06-23 |archive-date=2011-05-20 |archive-url=https://web.archive.org/web/20110520115337/http://cerncourier.com/cws/article/cern/29199 |url-status=live }}</ref> to have been created during the Big Bang, unlike currently known black holes. [[Martin Rees]] has theorized that a black hole, exploding via Hawking radiation, might produce a signal that's detectable in the radio.  The Astropulse project hopes that this evaporation would produce radio waves that Astropulse can detect. The evaporation wouldn't create radio waves directly. Instead, it would create an expanding fireball of high-energy [[gamma rays]] and particles. This fireball would interact with the surrounding magnetic field, pushing it out and generating radio waves.<ref>{{cite web |url=http://setiathome.berkeley.edu/ap_prbh.php |title=Primordial Black Holes |access-date=2010-06-23 |archive-date=2010-11-06 |archive-url=https://web.archive.org/web/20101106070600/http://setiathome.berkeley.edu/ap_prbh.php |url-status=live }}</ref>

=== ET ===
{{Main|Search for extraterrestrial intelligence}}
Previous searches by various "search for extraterrestrial intelligence" (SETI) projects, starting with [[Project Ozma]], have looked for extraterrestrial communications in the form of narrow-band signals, analogous to our own radio stations. The [[Astropulse]] project argues that since we know nothing about how ET might communicate, this might be a bit closed-minded. Thus, the Astropulse Survey can be viewed{{by whom|date=October 2016}} as complementary to the narrow-band SETI@home survey as a by-product of the search for physical phenomena.{{citation needed|date=October 2016}}

===Other undiscovered phenomena ===
Explaining their discovery in 2005 of a powerful bursting radio source, NRL astronomer Dr. Joseph Lazio stated:<ref>{{cite web |url=http://www.nrao.edu/pr/2005/newsource/ |title=Astronomers Detect Powerful Bursting Radio Source Discovery Points to New Class of Astronomical Objects |author=Andrea Gianopoulos |author2=Shannon Wells |author3=Michelle Lurch-Shaw |author4=Janice Schultz |author5=DonnaMcKinney |date=2005-03-02 |access-date=2010-06-23 |archive-date=2016-08-18 |archive-url=https://web.archive.org/web/20160818134111/http://www.nrao.edu/pr/2005/newsource/ |url-status=live }}</ref> "Amazingly, even though the sky is known to be full of transient objects emitting at X- and gamma-ray wavelengths, very little has been done to look for radio bursts, which are often easier for astronomical objects to produce."  The use of coherent dedispersion algorithms and the computing power provided by the SETI network may lead to discovery of previously undiscovered phenomena.